Recently, I bought the Mask Maker VS Skull Grinder set.
I fixed a few things.
Skull Grinder's Mask Stealer Staff Arm.
I just watched JANGBRICK's video.
I also took off Ekimu's third gear (it really isn't necessary), and used it as one of the gears for Grinder's right arm.
Before, Ekimu had a yellow brain-stalk, when originally he should have blue.
So I bought Nilkuu the Protector of Stone, who should have had a yellow brain-stalk, and just switched the brain-stalks.
Ekimu's Hammer of Power
When I saw how small Ekimu's Hammer of Power was before I bought it, I had to admit I was a bit disappointed.
So I planned ahead.
Using an extra T-Bar piece (seen above on Step 2), I replaced the other T-Bar piece (seen below on Step 2) with the first T-Bar piece.
This made it so I could insert whatever long-rod piece to make the Hammer taller in comparison to Ekimu.
Here's a picture of the result.
All in all, it was a worth-while improvement.
Heck it was so cool, that while my brother and I were battling with Ekimu and Skull Grinder, Ekimu actually knocked the Skull Mask/Mask of Creation off Skull Grinder's face because it was the right size!!
It Was Awesome!
Even though you are right about the head articulation, I am just satisfied with it and have no real reason to change it.
I have a feeling though that sets in the future will have smaller gear-boxes which can be added to the Protectors.
I'm not 100% sure, but I'm still about... mmm 60% convinced it will happen soon.